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Air Pollution Committee air pollution control air pollution problems air quality alkali inspectorate Annual Report appliances application approved atmosphere best practicable means Board of Health British Clean Air burning Central Government chief air pollution Chief Chemical Inspector Clean Air Act clean air council Clean Air Society clean air zones co-ordinating coal Country Planning Act dated Department of Health domestic fires domestic heating domestic premises emission standards enforcement equipment establishment of clean existing fuel function Health Act 1956 hydrogen sulphide industrial processes internal combustion engines licensing local authorities ment Meteorological Minister of Health motor vehicles nitrogen oxides North Island nuisance offensive organisations overseas oxides pollution control officer proposed Act proposed Clean Air Queensland recognises RECOMMENDATION—That recommendations reduce responsibility Ringelmann scheduled industry significant smoke density smoke pollution Smoke Restriction Regulations sources of pollution sulphur dioxide suspended particulate technical resources Town and Country United Kingdom urban Zealand